JPS63193749U - - Google Patents

Description

[Brief explanation of the drawing]

Figure 1 is a basic conceptual diagram of the present invention, Figures 2 to 6 are diagrams showing a first embodiment of the air-fuel ratio control device according to the present invention, Figure 2 is its overall configuration diagram, and Figure 3 is its A configuration diagram of the control unit, FIG. 4 is a flowchart showing the air amount correction control program, FIG. 5 is a timing chart to explain its operation, and FIG. 6 is a flowchart showing the air amount correction subroutine. , Figures 7 to 13 are diagrams showing a second embodiment of the air-fuel ratio control device according to the present invention, Figure 7 is a sectional view of the flow rate control valve, and Figure 8 explains the operation of the bypass air. Fig. 9 is a circuit diagram of the part that controls the flow rate control valve, Fig. 10 is a waveform diagram showing the output signal of the crank angle sensor, and Fig. 11 is the air amount correction control program. FIG. 12 is a timing chart for explaining the operation of the flow control valve, FIG. 13 is a waveform diagram showing other aspects of the drive pulse of the flow control valve, and FIGS. 14 to 25 are conventional timing charts. 14 is a configuration diagram of its fuel system, FIG. 15 is a configuration diagram of its air system, FIG. 16 is a block diagram of its control unit, and FIG. 17 is a diagram showing the air-fuel ratio control device.
The figure is a battery voltage correction curve diagram for that battery voltage, Figure 18 is a water temperature increase correction curve diagram for that water temperature, Figure 19 is a post-start increase correction curve diagram for that water temperature, and Figure 20 is a post-idling increase correction curve for that water temperature. A curve diagram, FIG. 21 is an explanatory diagram of the PI control of the air-fuel ratio feedback correction coefficient α, and FIG. 22 is a diagram showing the interrelationship among the air-fuel ratio, _O2 sensor voltage, and air-fuel ratio feedback correction coefficient α in the PI control. , Fig. 23 is a change curve of the fuel injection amount TST depending on the water temperature at the time of starting the engine, and Fig. 24 is a correction coefficient K depending on the engine speed.
FIG. 25 is a curve diagram showing the change in the correction coefficient KTST depending on the elapsed time after starting. 21...engine, 26...throttle valve, 30...bypass passage, 32...bypass valve, 34...O ₂
Sensor (air-fuel ratio sensor), 35...Cylinder discrimination sensor (cylinder stroke detection means), 36...Crank angle sensor, 37...Air amount variable means, 40...Control unit (air-fuel ratio discrimination means, air-fuel ratio control means) ), 51...flow control valve (bypass valve).

Claims (1)

[Scope of Claim for Utility Model Registration] (a) An air-fuel ratio sensor that outputs a signal related to the air-fuel ratio based on components in exhaust gas, (b) Cylinder stroke detection means that detects a cylinder in the combustion stroke, ( c) an air-fuel ratio determination means for determining the air-fuel ratio for each cylinder based on the outputs of the air-fuel ratio sensor and the cylinder stroke detection means; and (d) an air-fuel ratio determination means for determining the air-fuel ratio of each cylinder to a target value based on the output of the air-fuel ratio determination means. (e) air-fuel ratio control means for calculating a correction air amount for correcting the intake air amount supplied to the engine in one combustion cycle so that the amount of intake air is correspondingly uniform, and outputting a correction signal at a timing for each cylinder; An air-fuel ratio control device comprising: an air amount variable means for changing the air flow rate in a passage that bypasses a throttle valve in an intake passage at a correction timing for each cylinder based on a correction signal from a control means.